Clamp



ELSE. vl"fl X5 CLAMP Fuga upv. 27, 1935 14 El@ L7, 45 lil-21 f UJVENTOR. I l HHJILDSLELYT K Patented Feb. 9, 1937 circo STATS PATENT OFFICE 2 Claims.

This invention relates to improvements in clamps and has particular reference to a clamp for holding form boards such as are commonly employed in the casting of concrete and other plastic substances.

The principal object is to produce a clamp which may be adjusted to various sizes of forms and one which may be readily handled by a single person, in counter-distinction to clamps which require one or more laborers to install.

A further object is to produce a clamp which may be adjustably secured to any form having a plurality of straight sides, such as square columns or octagonal columns.

A still further object is to produce a device which is economical to manufacture and one which may be salvaged when the form boards are removed.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawing forming a part of this specication and in which like numerals are employed to designate like parts throughout the same,

25 Fig. l is a side elevation of a form having my clamp attached thereto,

Fig. 2 is a top plan View of Fig. 1,

Fig. 3 is an enlarged cross sectional View on the line 3-3 of Fig. 2, and

30 Fig. 4 is an enlarged cross sectional view taken on the line 5 4 of Fig. 2.

In the building of columns, particularly concrete columns, it is necessary to employ form boards between which the concrete is poured.

35 These boards may be set up in various shapes such as a rectangular structure, octagonal or hexagonal. In order to hold these form boards in a simple manner, I have devised a clamp which is progressively carried around the form 40 and locked in place. I have further provided means whereby the progressive action is dependent upon a plurality of linked arms which may be adjusted relative to each other so as to produce desired links.

45 In the accompanying drawing wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numerals 5, 6, I and 8 designate four form boards, such as would be employed in building a square column. My

50 invention consists of a series of bars A, B, C and D. The bar A is bifurcated as indicated by the numeral 9 and is provided on its inner edge with a hook Il adapted to engage the form board 6, the bifurcated end of said bar being adapted to 55 receive the free end of bar D. The bars B and C are identical and each are provided with a link l2 adapted to enter notches I4 formed in the bars A or B, as the case may be. The bar D has a link I6 similar to the links l2 also adapted to engage notches l1 formed in the bar C. This bar D has 5 a series of pin receiving openings I8 extending therethrough and when the end of the bar D is passed through the bifurcation 9, as shown in Figs. l and 2, a pin I9 preferably in the form of a nail may be passed through the proper 10 openings and come to rest in a notch 2| formed in the outer edge of the bar A.

With this construction, the manner of employing my bars is as follows:-

First the bar A is placed adjacent the side 7 15 of the form with the hook ll engaging the corners of the form. This hook will grip the edge of the form board 6 and will, therefore, be held in place when the operator moves to the opposite end of the bar. The bar B is then placed so that the same overlaps the end of the bar A with the link i2 engaging the proper notch in the bar A. The bar C is then engaged with the bar B in theV same manner, as is also the bar D. The bar D will have its free end passing through the bifurcation 9 and then the pin I9 is placed. Thus the operator may move around the structure until the entire clamp has been properly arranged and is securely fastened in place.

It will be apparent that the lever and link arrangement between the various bars enables the same to be tightly engaged with the clamp boards, thus making a strong structure.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

I-Iaving thus described my invention, I claim 1. In a device of the class described, a plurality of bars, means forming a clamp for concrete forms comprising means for hinging certain of said bars to the next succeeding bar, comprising links pivoted in the ends of the bars and capable of engaging notches ormed in the opposite ends of adjacent bars, one of said bars having a bifuroated end capable of receiving the free end of another of said bars, and a locking pin extending through the end of said last mentioned bar and capable of adjustably retaining the bifurcated bar securely against the form.

2. In a device of the class described, a clamp opposite ends thereof, the end bar of the series engaging the rst mentioned bar and passing through the bifurcation formed therein, and a locking pin extending through said last mentioned bar and engaging a, notch formed in said 5 irst mentioned bar.

HENRY A. TILDSLEY. 

